Spring piston



hnez l, 1924..

w. e. HEGINBIOTTOM SPRING PISTON 2 Sheets-Shem Filed Ju ne 16 1920 111%.24, 1924. 1,498,689 v W. G. HEGINBOTTOM 's RING' PISTON Filed June 16', 1920 tion is to provide a piston which is com- 7 T all whom it may coiwemu Patented June 24, 1924} UNITED STATES TENT orrics. a

WALTER G. HEGINBOTTOM, OF FLINT, MICHIGAN, ASSIGNOR ONE-HALF TO'J'ACOB B. FRANCIS, OF FLINT, MICHIGAN srnnie I Application flledlune 16 Be it known that I Wit-mic. Hizenp:

-no'rroii, a citizen of the United States, re-

siding at Flint. in the county of Genesee" and State of Michigan, have invented cer-- tain new and useful Improvementsin Spring-Pistons, of which the following is-- a specification, reference being had therein to the accompanying drawing.

This invention relatesto a certain new anduseful improvement in a spring piston for an internal combustion engine, the object being to provide a piston with resilient guide membersfor guiding the piston in the cylinder so as to eliminate piston slap. Another and furtherobject of theinvenv posed of a head having arms provided with curved guidingmembers separated. from the piston head properso as to carry off the heat fIOIl'I thB center of the piston.

A still further object of the invention is to provide a piston with guide members separated by large gaps so as to compensate for expansion.

Another and further'object of the inven tion is to provide a piston-which is ex- 1 ceediiigly simple and cheap in construction.

and one which can be formed in such a manner that the piston head proper is formed of such 'a size that a clearance is provided to prevent the same from coming-1n contact with the walls ofsthe cylinder, the piston being guided by resilient guide members which are milled to substantially the same size as the cylinder, the resiliency of thej same allowing the guide members to ex: pand and contract.

, Other and further objects and advantages of the invention willbe hereinafter set forth and the-novel features thereof defined by I the appended claims. 1.

In the drawings,

Figure l-is a side cleva tion of a piston constructed in accordance with my inven tion. t Figure 2 is an end-view of the same.

Figure-3 is a section taken on line 3=.5 of Figure 4; and Figure is a section taken on line v4 -4 In constructing a piston in accordance with my invention -ivhic h is preferably formed of aluminum I provide a cup-shaped head 1 which is machined in accordance In constructing the piston PISTON.

930. Serial no. 389,517.

I with the regular practice inorder to pro- 'vide a clearance between the walls ofthe cylinder and the outer face of the head.

arms 3 p'rovidedwith circular. guide members 4 which are struck on the arc of a circle so as to fit tightly within the cylinder.

The arms 3 are substantially T shaped in cross sectionas clearly shown and are con-.

nected to the head of the cup-shaped piston by a. connecting Web as'clearly shown and are resilient to a'certain extent so as *to allow the guide members 4 to expand and contract in order to contact with the walls of the cylinder in such a'-mannerthat pis-' ton slap is prevented, the piston being i movement in the cylinders.

it is preferably cast of'aliiminum with the guide members 3 integral with the-head 1,, the same being guided by the guide membersalone in its separated therefrom at'5 by sawing the same, it of course being understood that after the piston {has been cast and turned, the guide members are separated by a saw cut from the-piston head proper and the guides then groundto a diameter of the .y linder. from the piston proper the heat is prevent ed from being transferred .fromthe walls of the piston'to the guide members. In Fig.- ure 1 I havelshown in dottedline's the outer. face of the guide members extended to show the difference indiameter'hetween the pis" ton-head proper and the guide members.

Arranged betweenth'e oppositely disposed guide members 4' are. .piston ring. bosses 6" cast integral with the head, 1 and-provided with supportiri'g'braces 7 which are so con-. structed as to retard the travel of heat from the head "to the piiibosses .1

By separating the guide members 7 1:00. From theabove descr ption it will be see'lrthat' a pistonhas'bcenproduced'com posed. of a cup;s h'a-ped head reduced in di- 3 ameter to provide a clearance in connection a I 1'05] lgreat'erldianteterfor contacting with-thewith a pair of curved guideimembers of a cylinder in"which the pistonis placed for-'- guiding the piston in its movement, the

guide members being carried by downwardly extending arms formed on-t'he in-- tion of the head and not to the circular wall of the dish are free to yield under expansion whereby a piston is produced vwhich elimimates piston slap, compensates for expansien and contraction at d also provides means for carrying-0H tie extreme heat from the center of the piston head and I have found in practice that a piston constructed as herein shown and described when in use in the cylinder of an internal COHlbLtStii'Hl engine decreases the oil consnn'iption without affecting theveificiency of the lulufication of the piston.

What I claim is?- 1. piston for internal, combustion en the arms being secured to the interior of the disk portion of the head and provided with curved outer. ends and, curved guide members having their central portions secured to the ends of said arms.

A piston for internal combustion enginesconiprising a cup-shaped head having peripheral ring receiving grooves, said head being prmided with Wrist pin bosses, the interior of said piston being provided with resilient arms substantially T-shaped in cross section having curved ends and curved guide members carried by the ends of said arms, said curved guide members being separated from the piston and connected to the arms intermediate their ends.

In testimony whereof I have hereunto WM. H. ALEXANDER, GEO. TAF'T.

- Witnesses. 

